791 lines
18 KiB
C
791 lines
18 KiB
C
/**
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* See Copyright Notice in picrin.h
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*/
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#include "picrin.h"
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#include "picrin/extra.h"
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#include "value.h"
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#include "object.h"
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#undef EOF
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#define EOF (-1)
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KHASH_DECLARE(read, int, pic_value)
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KHASH_DEFINE(read, int, pic_value, kh_int_hash_func, kh_int_hash_equal)
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struct reader_control {
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int typecase;
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khash_t(read) labels;
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};
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#define CASE_DEFAULT 0
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#define CASE_FOLD 1
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typedef pic_value (*pic_reader_t)(pic_state *, pic_value port, int c, struct reader_control *);
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static pic_reader_t reader_table[256];
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static pic_reader_t reader_dispatch[256];
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static pic_value read_value(pic_state *pic, pic_value port, int c, struct reader_control *p);
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static pic_value read_nullable(pic_state *pic, pic_value port, int c, struct reader_control *p);
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PIC_NORETURN static void
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read_error(pic_state *pic, const char *msg, pic_value irritants)
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{
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pic_raise(pic, pic_make_error(pic, "read", msg, irritants));
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}
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static int
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skip(pic_state *pic, pic_value port, int c)
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{
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while (isspace(c)) {
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c = pic_fgetc(pic, port);
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}
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return c;
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}
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static int
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next(pic_state *pic, pic_value port)
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{
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return pic_fgetc(pic, port);
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}
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static int
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peek(pic_state *pic, pic_value port)
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{
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int c;
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pic_ungetc(pic, (c = pic_fgetc(pic, port)), port);
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return c;
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}
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static bool
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expect(pic_state *pic, pic_value port, const char *str)
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{
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int c;
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while ((c = (int)*str++) != 0) {
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if (c != peek(pic, port))
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return false;
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next(pic, port);
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}
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return true;
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}
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static bool
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isdelim(int c)
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{
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return c == EOF || strchr("();,|\" \t\n\r", c) != NULL; /* ignores "#", "'" */
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}
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static int
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case_fold(int c, struct reader_control *p)
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{
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if (p->typecase == CASE_FOLD) {
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c = tolower(c);
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}
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return c;
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}
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static pic_value
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read_comment(pic_state *pic, pic_value port, int c, struct reader_control *PIC_UNUSED(p))
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{
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do {
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c = next(pic, port);
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} while (! (c == EOF || c == '\n'));
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return pic_invalid_value(pic);
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}
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static pic_value
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read_block_comment(pic_state *pic, pic_value port, int PIC_UNUSED(c), struct reader_control *PIC_UNUSED(p))
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{
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int x, y;
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int i = 1;
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y = next(pic, port);
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while (y != EOF && i > 0) {
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x = y;
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y = next(pic, port);
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if (x == '|' && y == '#') {
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i--;
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}
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if (x == '#' && y == '|') {
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i++;
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}
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}
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return pic_invalid_value(pic);
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}
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static pic_value
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read_datum_comment(pic_state *pic, pic_value port, int PIC_UNUSED(c), struct reader_control *p)
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{
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read_value(pic, port, next(pic, port), p);
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return pic_invalid_value(pic);
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}
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static pic_value
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read_directive(pic_state *pic, pic_value port, int c, struct reader_control *p)
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{
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switch (peek(pic, port)) {
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case 'n':
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if (expect(pic, port, "no-fold-case")) {
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p->typecase = CASE_DEFAULT;
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return pic_invalid_value(pic);
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}
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break;
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case 'f':
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if (expect(pic, port, "fold-case")) {
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p->typecase = CASE_FOLD;
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return pic_invalid_value(pic);
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}
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break;
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}
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return read_comment(pic, port, c, p);
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}
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static pic_value
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read_quote(pic_state *pic, pic_value port, int PIC_UNUSED(c), struct reader_control *p)
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{
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return pic_list(pic, 2, pic_intern_lit(pic, "quote"), read_value(pic, port, next(pic, port), p));
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}
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static pic_value
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read_quasiquote(pic_state *pic, pic_value port, int PIC_UNUSED(c), struct reader_control *p)
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{
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return pic_list(pic, 2, pic_intern_lit(pic, "quasiquote"), read_value(pic, port, next(pic, port), p));
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}
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static pic_value
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read_unquote(pic_state *pic, pic_value port, int PIC_UNUSED(c), struct reader_control *p)
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{
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pic_value tag;
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if (peek(pic, port) == '@') {
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tag = pic_intern_lit(pic, "unquote-splicing");
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next(pic, port);
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} else {
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tag = pic_intern_lit(pic, "unquote");
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}
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return pic_list(pic, 2, tag, read_value(pic, port, next(pic, port), p));
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}
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static pic_value
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read_syntax_quote(pic_state *pic, pic_value port, int PIC_UNUSED(c), struct reader_control *p)
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{
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return pic_list(pic, 2, pic_intern_lit(pic, "syntax-quote"), read_value(pic, port, next(pic, port), p));
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}
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static pic_value
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read_syntax_quasiquote(pic_state *pic, pic_value port, int PIC_UNUSED(c), struct reader_control *p)
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{
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return pic_list(pic, 2, pic_intern_lit(pic, "syntax-quasiquote"), read_value(pic, port, next(pic, port), p));
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}
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static pic_value
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read_syntax_unquote(pic_state *pic, pic_value port, int PIC_UNUSED(c), struct reader_control *p)
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{
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pic_value tag;
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if (peek(pic, port) == '@') {
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tag = pic_intern_lit(pic, "syntax-unquote-splicing");
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next(pic, port);
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} else {
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tag = pic_intern_lit(pic, "syntax-unquote");
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}
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return pic_list(pic, 2, tag, read_value(pic, port, next(pic, port), p));
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}
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static pic_value
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read_atom(pic_state *pic, pic_value port, int c, struct reader_control *p) {
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int len;
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char *buf;
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pic_value str;
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len = 1;
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buf = pic_malloc(pic, len + 1);
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buf[0] = case_fold(c, p);
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buf[1] = 0;
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while (! isdelim(peek(pic, port))) {
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c = next(pic, port);
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len += 1;
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buf = pic_realloc(pic, buf, len + 1);
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buf[len - 1] = case_fold(c, p);
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buf[len] = 0;
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}
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str = pic_str_value(pic, buf, len);
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pic_free(pic, buf);
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return str;
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}
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static pic_value
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read_symbol(pic_state *pic, pic_value port, int c, struct reader_control *p)
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{
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return pic_intern(pic, read_atom(pic, port, c, p));
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}
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static pic_value
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read_number(pic_state *pic, pic_value port, int c, struct reader_control *p)
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{
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pic_value str = read_atom(pic, port, c, p), num;
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num = pic_funcall(pic, "picrin.base", "string->number", 1, str);
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if (! pic_false_p(pic, num)) {
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return num;
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}
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return pic_intern(pic, str);
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}
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static unsigned
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read_uinteger(pic_state *pic, pic_value port, int c, struct reader_control *PIC_UNUSED(p))
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{
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unsigned u = 0;
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if (! isdigit(c)) {
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read_error(pic, "expected one or more digits", pic_list(pic, 1, pic_char_value(pic, c)));
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}
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u = c - '0';
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while (isdigit(c = peek(pic, port))) {
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u = u * 10 + next(pic, port) - '0';
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}
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return u;
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}
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static pic_value
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read_true(pic_state *pic, pic_value port, int c, struct reader_control *PIC_UNUSED(p))
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{
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if ((c = peek(pic, port)) == 'r') {
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if (! expect(pic, port, "rue")) {
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read_error(pic, "unexpected character while reading #true", pic_nil_value(pic));
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}
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} else if (! isdelim(c)) {
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read_error(pic, "non-delimiter character given after #t", pic_list(pic, 1, pic_char_value(pic, c)));
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}
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return pic_true_value(pic);
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}
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static pic_value
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read_false(pic_state *pic, pic_value port, int c, struct reader_control *PIC_UNUSED(p))
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{
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if ((c = peek(pic, port)) == 'a') {
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if (! expect(pic, port, "alse")) {
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read_error(pic, "unexpected character while reading #false", pic_nil_value(pic));
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}
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} else if (! isdelim(c)) {
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read_error(pic, "non-delimiter character given after #f", pic_list(pic, 1, pic_char_value(pic, c)));
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}
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return pic_false_value(pic);
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}
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static pic_value
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read_char(pic_state *pic, pic_value port, int c, struct reader_control *PIC_UNUSED(p))
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{
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c = next(pic, port);
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if (! isdelim(peek(pic, port))) {
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switch (c) {
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default: read_error(pic, "unexpected character after char literal", pic_list(pic, 1, pic_char_value(pic, c)));
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case 'a': c = '\a'; if (! expect(pic, port, "larm")) goto fail; break;
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case 'b': c = '\b'; if (! expect(pic, port, "ackspace")) goto fail; break;
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case 'd': c = 0x7F; if (! expect(pic, port, "elete")) goto fail; break;
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case 'e': c = 0x1B; if (! expect(pic, port, "scape")) goto fail; break;
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case 'n':
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if ((c = peek(pic, port)) == 'e') {
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c = '\n';
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if (! expect(pic, port, "ewline"))
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goto fail;
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} else {
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c = '\0';
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if (! expect(pic, port, "ull"))
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goto fail;
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}
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break;
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case 'r': c = '\r'; if (! expect(pic, port, "eturn")) goto fail; break;
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case 's': c = ' '; if (! expect(pic, port, "pace")) goto fail; break;
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case 't': c = '\t'; if (! expect(pic, port, "ab")) goto fail; break;
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}
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}
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return pic_char_value(pic, (char)c);
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fail:
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read_error(pic, "unexpected character while reading character literal", pic_list(pic, 1, pic_char_value(pic, c)));
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}
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static pic_value
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read_string(pic_state *pic, pic_value port, int c, struct reader_control *PIC_UNUSED(p))
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{
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char *buf;
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int size, cnt;
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pic_value str;
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size = 256;
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buf = pic_malloc(pic, size);
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cnt = 0;
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/* TODO: intraline whitespaces */
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while ((c = next(pic, port)) != '"') {
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if (c == '\\') {
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switch (c = next(pic, port)) {
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case 'a': c = '\a'; break;
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case 'b': c = '\b'; break;
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case 't': c = '\t'; break;
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case 'n': c = '\n'; break;
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case 'r': c = '\r'; break;
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}
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}
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buf[cnt++] = (char)c;
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if (cnt >= size) {
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buf = pic_realloc(pic, buf, size *= 2);
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}
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}
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buf[cnt] = '\0';
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str = pic_str_value(pic, buf, cnt);
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pic_free(pic, buf);
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return str;
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}
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static pic_value
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read_pipe(pic_state *pic, pic_value port, int c, struct reader_control *PIC_UNUSED(p))
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{
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char *buf;
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int size, cnt;
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pic_value sym;
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/* Currently supports only ascii chars */
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char HEX_BUF[3];
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size_t i = 0;
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size = 256;
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buf = pic_malloc(pic, size);
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cnt = 0;
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while ((c = next(pic, port)) != '|') {
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if (c == '\\') {
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switch ((c = next(pic, port))) {
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case 'a': c = '\a'; break;
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case 'b': c = '\b'; break;
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case 't': c = '\t'; break;
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case 'n': c = '\n'; break;
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case 'r': c = '\r'; break;
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case 'x':
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i = 0;
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while ((HEX_BUF[i++] = (char)next(pic, port)) != ';') {
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if (i >= sizeof HEX_BUF)
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read_error(pic, "expected ';'", pic_list(pic, 1, pic_char_value(pic, HEX_BUF[sizeof(HEX_BUF) - 1])));
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}
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c = (char)strtol(HEX_BUF, NULL, 16);
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break;
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}
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}
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buf[cnt++] = (char)c;
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if (cnt >= size) {
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buf = pic_realloc(pic, buf, size *= 2);
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}
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}
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buf[cnt] = '\0';
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sym = pic_intern_cstr(pic, buf);
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pic_free(pic, buf);
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return sym;
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}
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static pic_value
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read_blob(pic_state *pic, pic_value port, int c, struct reader_control *p)
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{
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int nbits, n;
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int len;
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unsigned char *dat;
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pic_value blob;
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nbits = 0;
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while (isdigit(c = next(pic, port))) {
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nbits = 10 * nbits + c - '0';
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}
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if (nbits != 8) {
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read_error(pic, "unsupported bytevector bit width", pic_list(pic, 1, pic_int_value(pic, nbits)));
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}
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if (c != '(') {
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read_error(pic, "expected '(' character", pic_list(pic, 1, pic_char_value(pic, c)));
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}
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len = 0;
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dat = NULL;
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c = next(pic, port);
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while ((c = skip(pic, port, c)) != ')') {
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n = read_uinteger(pic, port, c, p);
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if (n < 0 || (1 << nbits) <= n) {
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read_error(pic, "invalid element in bytevector literal", pic_list(pic, 1, pic_int_value(pic, n)));
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}
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len += 1;
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dat = pic_realloc(pic, dat, len);
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dat[len - 1] = (unsigned char)n;
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c = next(pic, port);
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}
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blob = pic_blob_value(pic, dat, len);
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pic_free(pic, dat);
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return blob;
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}
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static pic_value
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read_undef_or_blob(pic_state *pic, pic_value port, int c, struct reader_control *p)
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{
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if ((c = peek(pic, port)) == 'n') {
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if (! expect(pic, port, "ndefined")) {
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read_error(pic, "unexpected character while reading #undefined", pic_nil_value(pic));
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}
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return pic_undef_value(pic);
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}
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if (! isdigit(c)) {
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read_error(pic, "expect #undefined or #u8(...), but illegal character given", pic_list(pic, 1, pic_char_value(pic, c)));
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}
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return read_blob(pic, port, 'u', p);
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}
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static pic_value
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read_pair(pic_state *pic, pic_value port, int c, struct reader_control *p)
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{
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static const int tCLOSE = ')';
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pic_value car, cdr;
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retry:
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c = skip(pic, port, ' ');
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if (c == tCLOSE) {
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return pic_nil_value(pic);
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}
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if (c == '.' && isdelim(peek(pic, port))) {
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cdr = read_value(pic, port, next(pic, port), p);
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closing:
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if ((c = skip(pic, port, ' ')) != tCLOSE) {
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if (pic_invalid_p(pic, read_nullable(pic, port, c, p))) {
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goto closing;
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}
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read_error(pic, "unmatched parenthesis", pic_nil_value(pic));
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}
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return cdr;
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}
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else {
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car = read_nullable(pic, port, c, p);
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if (pic_invalid_p(pic, car)) {
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goto retry;
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}
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cdr = read_pair(pic, port, '(', p);
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return pic_cons(pic, car, cdr);
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}
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}
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static pic_value
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read_vector(pic_state *pic, pic_value port, int c, struct reader_control *p)
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{
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pic_value list, it, elem, vec;
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int i = 0;
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list = read_value(pic, port, c, p);
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vec = pic_make_vec(pic, pic_length(pic, list), NULL);
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pic_for_each (elem, list, it) {
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pic_vec_set(pic, vec, i++, elem);
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}
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return vec;
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}
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static pic_value
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read_label_set(pic_state *pic, pic_value port, int i, struct reader_control *p)
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{
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khash_t(read) *h = &p->labels;
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pic_value val;
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int c, ret, it;
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|
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it = kh_put(read, h, i, &ret);
|
|
|
|
switch ((c = skip(pic, port, ' '))) {
|
|
case '(':
|
|
{
|
|
pic_value tmp;
|
|
|
|
kh_val(h, it) = val = pic_cons(pic, pic_undef_value(pic), pic_undef_value(pic));
|
|
|
|
tmp = read_value(pic, port, c, p);
|
|
pic_pair_ptr(pic, val)->car = pic_car(pic, tmp);
|
|
pic_pair_ptr(pic, val)->cdr = pic_cdr(pic, tmp);
|
|
|
|
return val;
|
|
}
|
|
case '#':
|
|
{
|
|
bool vect;
|
|
|
|
if (peek(pic, port) == '(') {
|
|
vect = true;
|
|
} else {
|
|
vect = false;
|
|
}
|
|
|
|
if (vect) {
|
|
pic_value tmp;
|
|
|
|
kh_val(h, it) = val = pic_make_vec(pic, 0, NULL);
|
|
|
|
tmp = read_value(pic, port, c, p);
|
|
PIC_SWAP(pic_value *, pic_vec_ptr(pic, tmp)->data, pic_vec_ptr(pic, val)->data);
|
|
PIC_SWAP(int, pic_vec_ptr(pic, tmp)->len, pic_vec_ptr(pic, val)->len);
|
|
|
|
return val;
|
|
}
|
|
|
|
/* fall through */
|
|
}
|
|
default:
|
|
{
|
|
kh_val(h, it) = val = read_value(pic, port, c, p);
|
|
|
|
return val;
|
|
}
|
|
}
|
|
}
|
|
|
|
static pic_value
|
|
read_label_ref(pic_state *pic, pic_value PIC_UNUSED(port), int i, struct reader_control *p)
|
|
{
|
|
khash_t(read) *h = &p->labels;
|
|
int it;
|
|
|
|
it = kh_get(read, h, i);
|
|
if (it == kh_end(h)) {
|
|
read_error(pic, "label of given index not defined", pic_list(pic, 1, pic_int_value(pic, i)));
|
|
}
|
|
return kh_val(h, it);
|
|
}
|
|
|
|
static pic_value
|
|
read_label(pic_state *pic, pic_value port, int c, struct reader_control *p)
|
|
{
|
|
int i;
|
|
|
|
i = 0;
|
|
do {
|
|
i = i * 10 + c - '0';
|
|
} while (isdigit(c = next(pic, port)));
|
|
|
|
if (c == '=') {
|
|
return read_label_set(pic, port, i, p);
|
|
}
|
|
if (c == '#') {
|
|
return read_label_ref(pic, port, i, p);
|
|
}
|
|
read_error(pic, "broken label expression", pic_nil_value(pic));
|
|
}
|
|
|
|
static pic_value
|
|
read_unmatch(pic_state *pic, pic_value PIC_UNUSED(port), int PIC_UNUSED(c), struct reader_control *PIC_UNUSED(p))
|
|
{
|
|
read_error(pic, "unmatched parenthesis", pic_nil_value(pic));
|
|
}
|
|
|
|
static pic_value
|
|
read_dispatch(pic_state *pic, pic_value port, int c, struct reader_control *p)
|
|
{
|
|
c = next(pic, port);
|
|
|
|
if (c == EOF) {
|
|
read_error(pic, "unexpected EOF", pic_nil_value(pic));
|
|
}
|
|
|
|
if (reader_dispatch[c] == NULL) {
|
|
read_error(pic, "invalid character at the seeker head", pic_list(pic, 1, pic_char_value(pic, c)));
|
|
}
|
|
|
|
return reader_dispatch[c](pic, port, c, p);
|
|
}
|
|
|
|
static pic_value
|
|
read_nullable(pic_state *pic, pic_value port, int c, struct reader_control *p)
|
|
{
|
|
c = skip(pic, port, c);
|
|
|
|
if (c == EOF) {
|
|
read_error(pic, "unexpected EOF", pic_nil_value(pic));
|
|
}
|
|
|
|
if (reader_table[c] == NULL) {
|
|
read_error(pic, "invalid character at the seeker head", pic_list(pic, 1, pic_char_value(pic, c)));
|
|
}
|
|
|
|
return reader_table[c](pic, port, c, p);
|
|
}
|
|
|
|
static pic_value
|
|
read_value(pic_state *pic, pic_value port, int c, struct reader_control *p)
|
|
{
|
|
pic_value val;
|
|
|
|
retry:
|
|
val = read_nullable(pic, port, c, p);
|
|
|
|
if (pic_invalid_p(pic, val)) {
|
|
c = next(pic, port);
|
|
goto retry;
|
|
}
|
|
|
|
return val;
|
|
}
|
|
|
|
static void
|
|
reader_table_init(void)
|
|
{
|
|
int c;
|
|
|
|
for (c = 0; c < 256; ++c) {
|
|
reader_table[c] = NULL;
|
|
}
|
|
for (c = 0; c < 256; ++c) {
|
|
reader_dispatch[c] = NULL;
|
|
}
|
|
|
|
/* default reader */
|
|
for (c = 1; c < 256; ++c) {
|
|
reader_table[c] = read_symbol;
|
|
}
|
|
|
|
reader_table[')'] = read_unmatch;
|
|
reader_table[';'] = read_comment;
|
|
reader_table['\''] = read_quote;
|
|
reader_table['`'] = read_quasiquote;
|
|
reader_table[','] = read_unquote;
|
|
reader_table['"'] = read_string;
|
|
reader_table['|'] = read_pipe;
|
|
reader_table['('] = read_pair;
|
|
reader_table['#'] = read_dispatch;
|
|
reader_table['+'] = read_number;
|
|
reader_table['-'] = read_number;
|
|
for (c = '0'; c <= '9'; ++c) {
|
|
reader_table[c] = read_number;
|
|
}
|
|
|
|
reader_dispatch['!'] = read_directive;
|
|
reader_dispatch['|'] = read_block_comment;
|
|
reader_dispatch[';'] = read_datum_comment;
|
|
reader_dispatch['t'] = read_true;
|
|
reader_dispatch['f'] = read_false;
|
|
reader_dispatch['\''] = read_syntax_quote;
|
|
reader_dispatch['`'] = read_syntax_quasiquote;
|
|
reader_dispatch[','] = read_syntax_unquote;
|
|
reader_dispatch['\\'] = read_char;
|
|
reader_dispatch['('] = read_vector;
|
|
reader_dispatch['u'] = read_undef_or_blob;
|
|
|
|
/* read labels */
|
|
for (c = '0'; c <= '9'; ++c) {
|
|
reader_dispatch[c] = read_label;
|
|
}
|
|
}
|
|
|
|
static void
|
|
reader_init(pic_state *PIC_UNUSED(pic), struct reader_control *p)
|
|
{
|
|
p->typecase = CASE_DEFAULT;
|
|
kh_init(read, &p->labels);
|
|
}
|
|
|
|
static void
|
|
reader_destroy(pic_state *pic, struct reader_control *p)
|
|
{
|
|
kh_destroy(read, &p->labels);
|
|
}
|
|
|
|
pic_value
|
|
pic_read(pic_state *pic, pic_value port)
|
|
{
|
|
struct reader_control p;
|
|
size_t ai = pic_enter(pic);
|
|
pic_value val;
|
|
int c;
|
|
pic_value e;
|
|
|
|
reader_init(pic, &p);
|
|
|
|
pic_try {
|
|
while ((c = skip(pic, port, next(pic, port))) != EOF) {
|
|
val = read_nullable(pic, port, c, &p);
|
|
|
|
if (! pic_invalid_p(pic, val)) {
|
|
break;
|
|
}
|
|
pic_leave(pic, ai);
|
|
}
|
|
if (c == EOF) {
|
|
val = pic_eof_object(pic);
|
|
}
|
|
}
|
|
pic_catch(e) {
|
|
reader_destroy(pic, &p);
|
|
pic_raise(pic, e);
|
|
}
|
|
|
|
pic_leave(pic, ai);
|
|
return pic_protect(pic, val);
|
|
}
|
|
|
|
pic_value
|
|
pic_read_cstr(pic_state *pic, const char *str)
|
|
{
|
|
pic_value port = pic_fmemopen(pic, str, strlen(str), "r");
|
|
pic_value form, e;
|
|
|
|
pic_try {
|
|
form = pic_read(pic, port);
|
|
}
|
|
pic_catch(e) {
|
|
pic_fclose(pic, port);
|
|
pic_raise(pic, e);
|
|
}
|
|
|
|
pic_fclose(pic, port);
|
|
|
|
return form;
|
|
}
|
|
|
|
static pic_value
|
|
pic_read_read(pic_state *pic)
|
|
{
|
|
pic_value port = pic_stdin(pic);
|
|
|
|
pic_get_args(pic, "|p", &port);
|
|
|
|
return pic_read(pic, port);
|
|
}
|
|
|
|
void
|
|
pic_init_read(pic_state *pic)
|
|
{
|
|
reader_table_init();
|
|
|
|
pic_defun(pic, "read", pic_read_read);
|
|
}
|